In addition to the promise of disease therapies, the uses of stem cells in medical research include the study of how
_____.
a. diseases develop and progress before phenotypes are visible
b. Huntington Disease progresses in its latest stages
c. to engineer animal models for human disease
d. to harvest multipotent cells from human blastocysts
e. to fertilize human eggs in vitro
a
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Land plants most likely evolved from _____
a. brown algae b. red algae c. green algae d. bryophytes e. seedless vascular plants
A broad land or aquatic region characterized by climate, geography, and the species found within them is called ____
a. an ecoregion b. a hot spot c. a realm d. a habitat island e. the biosphere
Where would we expect to find electrical synapses?
A) within the brain B) within the heart C) within the spinal cord D) between interneurons and motor neurons
When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of
A) density-dependent regulation. B) exotic regulation. C) ecosystem carrying capacity. D) density-independent regulation. E) community carrying capacity.